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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34ec48e9713a9e588d6c13e99a1f19a2556ce98dcc8173207336d7502530adc8' 
  AND token = 'FTfltp7Tbl/9iOxwFG+CrGWb8KcQ2uQ2jHCpDw6vQKU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}